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Airprint not working on WLC5508 setup

Hi Tech guys

I have a customer with an WLC 5508 installation with Apple bonjour problems. Only one WLAN defined, all users and printers using the sam IP segment. All users are wireless, so are the printers. We are running 7.4.110 code on the controller. Tried with broadcast forwarding enabled, IP multicast enabled (, and disabled Peer-to-peer blocking.

This did not work, uses can't see any airprinters...

Tried wtih enabling the mDNS option, and defining all the relevant apple services. Now the users can see the apple airprinters, but they can still not print anything.

Is this software just very buggy, or have I missed something here? The customer has invested a lot in this installation (197 AP's in use), and the IT managers boss is somewhat pissed that this doesn't work. Especially since it works with no problems on the boss' Linksys AP at home !

Any good ideas?


Peter Lillelund

Scott Fella
Hall of Fame Guru

You say that the devices now can see the AirPrinter's but printing doesn't work?  If you have a dive that can AirPrint on the same subnet as the printer, does it work?  I'm assuming that currently your devices are on different subnets.  What devices are trying to print and what type of printers?



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Hi scott

All printers and mac's are on the same IP subnet attached to the same Wireless LAN. The only thing the controller should do is to forward the IP multicast, but somehow it doesn't.

Mac and pc can ping the printers, so basic ip communication works, but airprint, airtunes and other bonjour related functions does not.

It seams as though the controller prevents communication via bonjour when users and printers is placed on same ip subnet on the same WLAN.


One of the requirements also is igmp snooping. You also have to have multicast configured on the wired side. Take a look at this support doc that Cisco created a year or so ago when people stated putting Apple TV's in the network.

Yes, most soho wireless for the home just works, we all know that, enterprise wireless is a bit different and sometimes to get things like bonjour or multicast to work, it requires configuration on other devices. Soho devices for the home is a router and ap so it's easy for the manufacture to allow all this stuff to pass by default. Enterprise takes a different approach.

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Hi Scott

I do think that we have tried to follow Cisco's best practice. Since all users are on the same subnet, the use of a Bonjour gateway should not be necessary. So we will have to configure the controller to forward broadcast and multicasts.

We have configured the general setup of the controller as seen (Broadcast enabled, Multicast enabled as AP multicast address:


And we have enabled IGMP snooping:


And we have used it all on the WLAN:


P2P is disabled

Just for checking, we have also tried the built-in bonjour gateway, but that didn't change anything, it still doesn't work. I do think though, that if we made another WLAN, moved the printers to that network, and enabled the Bonjour gateway, this would work. But why on earth does it not work with only one WLAN?

Seams like a bug or Cisco's implementation of WiFi via controllers.



The doc I posted was just to reference the multicast required on the wired side. mDNS gateway isn't required because you have everything in the same subnet. If you have multicast enabled on the wired network and multicast enabled on the WLC, then something else is wrong. You can always download a bonjour browser program for windows and Mac and iOS devices to see what bonjour services you see.

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